*/
-#include <devices/os_debug.h>
+
#include <palacios/vmm.h>
+#include <palacios/vmm_dev_mgr.h>
+#include <palacios/vm_guest_mem.h>
+
+#define BUF_SIZE 1024
+#define DEBUG_PORT1 0xc0c0
-#define DEBUG_PORT1 0xcc
+struct debug_state {
+ char debug_buf[BUF_SIZE];
+ uint_t debug_offset;
+};
+static int handle_gen_write(struct guest_info * core, ushort_t port, void * src, uint_t length, void * priv_data) {
+ struct debug_state * state = priv_data;
-static int handle_gen_write(ushort_t port, void * src, uint_t length, struct vm_device * dev) {
- PrintError("OS_DEBUG Write\n");
+ state->debug_buf[state->debug_offset++] = *(char*)src;
- switch (length) {
- case 1:
- PrintDebug("OS_DEBUG ->0x%.2x\n", *(uchar_t*)src);
- break;
- case 2:
- PrintDebug("OS_DEBUG ->0x%.4x\n", *(ushort_t*)src);
- break;
- case 4:
- PrintDebug("OS_DEBUG ->0x%.8x\n", *(uint_t*)src);
- break;
- default:
- PrintError("OS_DEBUG -> Invalid length in handle_gen_write\n");
- return -1;
- break;
- }
+ if ((*(char*)src == 0xa) || (state->debug_offset == (BUF_SIZE - 1))) {
+ PrintDebug("VM_CONSOLE>%s", state->debug_buf);
+ memset(state->debug_buf, 0, BUF_SIZE);
+ state->debug_offset = 0;
+ }
- return length;
+ return length;
}
+static int handle_hcall(struct guest_info * info, uint_t hcall_id, void * priv_data) {
+ struct debug_state * state = (struct debug_state *)priv_data;
-static int debug_init(struct vm_device * dev) {
+ int msg_len = info->vm_regs.rcx;
+ addr_t msg_gpa = info->vm_regs.rbx;
+ int buf_is_va = info->vm_regs.rdx;
- v3_dev_hook_io(dev, DEBUG_PORT1, NULL, &handle_gen_write);
+ if (msg_len >= BUF_SIZE) {
+ PrintError("Console message too large for buffer (len=%d)\n", msg_len);
+ return -1;
+ }
-
- return 0;
+ if (buf_is_va == 1) {
+ if (v3_read_gva_memory(info, msg_gpa, msg_len, (uchar_t *)state->debug_buf) != msg_len) {
+ PrintError("Could not read debug message\n");
+ return -1;
+ }
+ } else {
+ if (v3_read_gpa_memory(info, msg_gpa, msg_len, (uchar_t *)state->debug_buf) != msg_len) {
+ PrintError("Could not read debug message\n");
+ return -1;
+ }
+ }
+
+ state->debug_buf[msg_len] = 0;
+
+ PrintDebug("VM_CONSOLE>%s\n", state->debug_buf);
+
+ return 0;
}
-static int debug_deinit(struct vm_device * dev) {
- v3_dev_unhook_io(dev, DEBUG_PORT1);
- return 0;
+static int debug_free(struct debug_state * state) {
+
+ // unregister hypercall
+
+ V3_Free(state);
+ return 0;
};
+#ifdef V3_CONFIG_CHECKPOINT
+static int debug_save(struct v3_chkpt_ctx * ctx, void * private_data) {
+ struct debug_state * dbg = (struct debug_state *)private_data;
+
+ V3_CHKPT_STD_SAVE(ctx, dbg->debug_buf);
+ V3_CHKPT_STD_SAVE(ctx, dbg->debug_offset);
+
+ return 0;
+}
+
+
+static int debug_load(struct v3_chkpt_ctx * ctx, void * private_data) {
+ struct debug_state * dbg = (struct debug_state *)private_data;
+
+ V3_CHKPT_STD_LOAD(ctx, dbg->debug_buf);
+ V3_CHKPT_STD_LOAD(ctx, dbg->debug_offset);
+
+ return 0;
+}
+
+#endif
-static struct vm_device_ops dev_ops = {
- .init = debug_init,
- .deinit = debug_deinit,
- .reset = NULL,
- .start = NULL,
- .stop = NULL,
+static struct v3_device_ops dev_ops = {
+ .free = (int (*)(void *))debug_free,
+#ifdef V3_CONFIG_CHECKPOINT
+ .save = debug_save,
+ .load = debug_load
+#endif
};
-struct vm_device * v3_create_os_debug() {
- PrintDebug("Creating OS Debug Device\n");
- struct vm_device * device = v3_create_device("OS Debug", &dev_ops, NULL);
+static int debug_init(struct v3_vm_info * vm, v3_cfg_tree_t * cfg) {
+ struct debug_state * state = NULL;
+ char * dev_id = v3_cfg_val(cfg, "ID");
+
+ state = (struct debug_state *)V3_Malloc(sizeof(struct debug_state));
+
+ PrintDebug("Creating OS Debug Device\n");
+
+ struct vm_device * dev = v3_add_device(vm, dev_id, &dev_ops, state);
+ if (dev == NULL) {
+ PrintError("Could not attach device %s\n", dev_id);
+ V3_Free(state);
+ return -1;
+ }
- return device;
+ if (v3_dev_hook_io(dev, DEBUG_PORT1, NULL, &handle_gen_write) == -1) {
+ PrintError("Error hooking OS debug IO port\n");
+ v3_remove_device(dev);
+ return -1;
+ }
+
+ v3_register_hypercall(vm, OS_DEBUG_HCALL, handle_hcall, state);
+
+ state->debug_offset = 0;
+ memset(state->debug_buf, 0, BUF_SIZE);
+
+ return 0;
}
+
+
+device_register("OS_DEBUG", debug_init)
